Pilot phase measurement error estimator for position location
First Claim
1. A method of estimating a pilot phase root mean square error comprising:
- determining a path width error;
determining a path drift error;
determining a measurement resolution error; and
combining the path width error, the path drift error, and the measurement resolution error to obtain a pilot phase root mean square error estimate.
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Accused Products
Abstract
A wireless communication system computes the pilot phase measurement RMSE directly by determining the path width as measured by the searcher component of the modem, the path drift over time, and the measurement resolution. The path width may be based on a measurement error that is half the path width or the larger of the distances from the local maxima to the earliest or latest side. Optionally, the distance from the peak to the 3 dB-down point can be used if the search resolution permits such measurement. The path drift is multiplied with the uncertainty in the measurement time stamp to get an error. This error is added to the measurement error due to path width. The measurement resolution is also added to the error.
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Citations
19 Claims
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1. A method of estimating a pilot phase root mean square error comprising:
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determining a path width error;
determining a path drift error;
determining a measurement resolution error; and
combining the path width error, the path drift error, and the measurement resolution error to obtain a pilot phase root mean square error estimate. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A wireless communication system comprising:
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a base station which transmits a pilot signal; and
a mobile station which receives the pilot signal and estimates a pilot phase measurement root mean square error using a path width, a path drift, and a measurement resolution. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification